Safety Measurement System

Measure vs. Percentile

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. Expand for more information.

Carrier violations or crashes are weighted by time and severity to produce a measure for that carrier in each BASIC. The measure only considers individual performance based on 24 months of data, with a measure of 0 indicating best performance. The measure is then used to assign that carrier to a percentile rank containing carriers’ information in similar safety event groups. The graph below shows how the carrier’s measure correlates with its percentile rank over a selected period of time.

Measure

Percentile

Measure	Percentile
0	0
0.12	1
0.28	2
0.44	3
0.58	4
0.70	5
0.79	6
0.88	7
0.98	8
1.05	9
1.11	10
1.16	11
1.22	12
1.29	13
1.34	14
1.38	15
1.43	16
1.48	17
1.52	18
1.59	19
1.64	20
1.69	21
1.73	22
1.77	23
1.82	24
1.88	25
1.92	26
1.96	27
2.00	28
2.05	29
2.10	30
2.16	31
2.22	32
2.26	33
2.30	34
2.33	35
2.38	36
2.43	37
2.50	38
2.54	39
2.57	40
2.62	41
2.66	42
2.72	43
2.78	44
2.82	45
2.87	46
2.92	47
2.97	48
3.02	49
3.08	50
3.12	51
3.16	52
3.21	53
3.27	54
3.34	55
3.41	56
3.47	57
3.52	58
3.58	59
3.64	60
3.71	61
3.77	62
3.83	63
3.87	64
3.93	65
4.00	66
4.07	67
4.15	68
4.23	69
4.28	70
4.38	71
4.44	72
4.51	73
4.57	74
4.63	75
4.71	76
4.80	77
4.85	78
4.93	79
5.06	80
5.14	81
5.25	82
5.38	83
5.49	84
5.63	85
5.76	86
5.87	87
6.02	88
6.18	89
6.35	90
6.59	91
6.79	92
7.05	93
7.29	94
7.58	95
8.12	96
8.72	97
9.59	98
11.58	99
18.13	100